Question

Correct the following sentence and give reason the United States have a Presidential
form of government​

Answer 1

Answer:

The United States has a Presidential form of government.

Explanation:

"has" needs to be used because "The United States" is a singular noun though it appears to be plural. It is the name of a country and like every proper noun is singular.

"The United States" is often preferred to " United States" though the latter is not wrong.